#include <stdio.h>
// 请把字符串"abcdefg"倒序输出
int main()
{
  char ch[] = "abcdefg";
  int all_length = sizeof(ch);
  int single_length = sizeof(ch[0]);
  int length = all_length / single_length;
  for (int i = length - 1; i >= 0; i--)
  {
    printf("%c", ch[i]);
  }
  return 0;
}